<template>
  <view class="main">
    <!-- 内容列表 -->
    <scroll-view scroll-y class="viewport">
      <!-- 购物车列表 -->
      <template v-if="profile">
        <!-- 优惠提示 -->
        <view class="tips">
          <text class="label">满减</text>
          <text class="desc">满1件, 即可享受9折优惠</text>
        </view>
        <view class="blank" v-if="carts.length === 0">
          购物车还是空的，快来挑选好货吧
        </view>
        <!-- 购物车商品 -->
        <view class="carts">
          <uni-swipe-action>
            <uni-swipe-action-item
              class="swipe-cell"
              v-for="item in carts"
              :key="item.skuId"
            >
              <navigator
                hover-class="none"
                :url="'/pages/goods/index?id=' + item.id"
                class="card"
              >
                <text
                  :class="[
                    'checkbox',
                    `icon-${item.selected ? 'checked' : 'ring'}`,
                  ]"
                  @tap.stop="changeSelected(item.skuId)"
                ></text>
                <!-- 商品缩略图 -->
                <image class="thumb" :src="item.picture"></image>
                <view class="meta">
                  <!-- 商品名称 -->
                  <view class="name ellipsis">{{ item.name }}</view>
                  <!-- 商品类型 -->
                  <view class="type ellipsis">{{ item.attrsText }}</view>
                  <!-- 价格 -->
                  <view class="price"> ¥{{ item.price }} </view>
                  <!-- 商品数量，阻止冒泡 -->
                  <view class="quantity" @tap.stop="() => {}">
                    <text @tap="changeCount(item.skuId, -1)" class="text"
                      >-</text
                    >
                    <input class="input" type="text" :value="item.count" />
                    <text @tap="changeCount(item.skuId, 1)" class="text"
                      >+</text
                    >
                  </view>
                </view>
              </navigator>

              <template v-slot:right>
                <view class="swipe-cell-action">
                  <button class="collect-button">移入收藏</button>
                  <button @tap="deleteCart(item.skuId)" class="delete-button">
                    删除
                  </button>
                </view>
              </template>
            </uni-swipe-action-item>
          </uni-swipe-action>
        </view>
      </template>
      <!-- 状态提示 -->
      <view class="blank" v-else>
        <text>登后后可查看购物车中的商品</text>
        <navigator url="/pages/login/index" hover-class="none">
          <button class="button">去登录</button>
        </navigator>
      </view>
    </scroll-view>

    <!-- 底部操作栏 -->
    <view class="toolbar" v-if="profile && carts.length !== 0">
      <text
        class="all"
        :class="{ checked: isSelectedAll }"
        @tap="changeSelectedAll"
        >全选</text
      >
      <text class="text">合计:</text>
      <text class="amount">{{ selectedCartsPrice }}</text>
      <!-- 操作按钮 -->
      <view class="buttons">
        <view
          class="button payment"
          @click="goToOrderCreate"
          :class="{ disabled: selectedCartsCount === 0 }"
        >
          去结算({{ selectedCartsCount }})
        </view>
        <view class="button collect">移入收藏</view>
        <view class="button delete">删除</view>
      </view>
    </view>
  </view>
</template>

<script>
import { mapState } from "vuex";
import {
  getMemberCart,
  putMemberCart,
  putMemberCartSelected,
  delMemberCart,
} from "@/http/cart";
export default {
  computed: {
    ...mapState("user", ["profile"]),
    // 勾选了的购物车数组
    selectedCarts() {
      return this.carts.filter((v) => v.selected);
    },
    // 是否全选
    isSelectedAll() {
      // 获取 购物车数量 this.carts.length    购物车选中的商品数量  this.carts.filter(v=>v.selected).length
      // 两个数量做比较 如果相等 就设置全选
      // 如果购物车长度为 0  也会返回true  但是 我们已经提前在 标签中进行过处理所以不需要担心
      return this.carts.length === this.selectedCarts.length;
    },
    // 勾选的商品总价
    selectedCartsPrice() {
      return this.selectedCarts.reduce((s, v) => s + v.price * v.count, 0);
    },
    // 勾选的商品数量
    selectedCartsCount() {
      return this.selectedCarts.reduce((s, v) => s + v.count, 0);
    },
  },
  data() {
    return {
      // 购物车数组
      carts: [],
    };
  },
  onShow() {
    // 判断是否有登录
    if (this.profile) {
      this.loadData();
    }
  },
  methods: {
    // 获取数据并渲染购物车
    async loadData() {
      const res = await getMemberCart();
      this.carts = res.result;
    },
    // 修改购物车商品选中状态
    async changeSelected(skuId) {
      // 根据skuId来找到它所在数组的下标
      const index = this.carts.findIndex((v) => v.skuId === skuId);
      // 获取它对应的选中状态 取反
      const selected = !this.carts[index].selected;
      // 拼接参数 发送给后端
      await putMemberCart(skuId, { selected });
      // 假设成功 给出提示
      // 重新获取最新的数据
      this.loadData();
    },
    // 修改商品数量
    async changeCount(skuId, unit) {
      const index = this.carts.findIndex((v) => v.skuId === skuId);
      // 获取已经选购的数量 和  库存
      let { count, stock } = this.carts[index];
      // 直接对数量做修改
      count += unit;
      // 判断
      if (count < 1) {
        uni.showToast({ title: "数量不少于1", icon: "none" });
        return;
      }

      if (count > stock) {
        uni.showToast({ title: "库存不足", icon: "none" });
        return;
      }

      // 拼接参数 发送给后端
      await putMemberCart(skuId, { count });
      // 重新获取最新的数据
      this.loadData();
    },
    // 设置全部商品的选中和取消选中
    async changeSelectedAll() {
      // 获取当前全选状态，然后取反
      const selected = !this.isSelectedAll;
      // 获取 skuId 集合
      const ids = this.carts.map((v) => v.skuId);

      // 调用接口 设置全选/不全选
      await putMemberCartSelected({ selected, ids });

      // 刷新页面数据
      this.loadData();
    },
    // 去结算
    goToOrderCreate() {
      // 先判断有没有选中要结算的商品
      if (this.selectedCartsCount === 0) {
        return uni.showToast({ title: "请选择下单商品~", icon: "none" });
      }
      // 有 跳转页面
      uni.navigateTo({ url: "/pages/order/create/index" });
    },
    // 删除商品
    async deleteCart(skuId) {
      const [err, { confirm }] = await uni.showModal({
        title: "警告",
        content: "您确定要删除吗",
      });
      if (confirm) {
        const ids = [skuId];
        delMemberCart({ ids });
        this.loadData();
      } else {
        console.log("取消了删除");
      }
    },
  },
};
</script>

<style lang="scss">
page {
  background-color: #f7f7f8;
  height: 100%;
}
.main {
  height: 100%;
  display: flex;
  flex-direction: column;
}
.viewport {
  min-height: 400rpx;
}
/* 顶部工具栏 */
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 88rpx;
  padding: 0 30rpx;
  font-size: 26rpx;
  color: #262626;
  background-color: #fff;
  .extra {
    display: flex;
    align-items: center;
    height: 24rpx;
    border-left: 1rpx solid #bfbfbf;
    .edit {
      padding: 0 30rpx;
    }
    .menu {
      width: 9rpx;
      height: 9rpx;
      padding: 14rpx;
      border-radius: 50%;
      background-color: #262626;
      background-clip: content-box;
      position: relative;
      &::before {
        left: 0;
      }
      &::after {
        right: 0;
      }
    }
  }
}
.topbar .extra .menu::before,
.topbar .extra .menu::after {
  position: absolute;
  top: 50%;
  content: "";
  width: 6rpx;
  height: 4rpx;
  background-color: #8c8c8c;
  transform: translateY(-50%);
  border-radius: 4rpx;
}
/* 优惠提示 */
.tips {
  display: flex;
  align-items: center;
  line-height: 1;
  padding: 30rpx;
  font-size: 26rpx;
  color: #666;
  .label {
    color: #fff;
    padding: 7rpx 15rpx 5rpx;
    border-radius: 4rpx;
    font-size: 24rpx;
    background-color: #27ba9b;
    margin-right: 10rpx;
  }
}
.carts {
  padding: 0 20rpx;
  .card {
    display: flex;
    padding: 20rpx 20rpx 20rpx 80rpx;
    border-radius: 10rpx;
    background-color: #fff;
    position: relative;
    .checkbox {
      position: absolute;
      top: 0;
      left: 0;
      display: flex;
      align-items: center;
      justify-content: center;
      width: 80rpx;
      height: 100%;
      font-size: 40rpx;
      color: #444;
    }
    .icon-checked {
      color: #27ba9b;
    }
    .thumb {
      width: 170rpx;
      height: 170rpx;
    }
    .meta {
      flex: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      margin-left: 20rpx;
    }
    .name {
      height: 72rpx;
      font-size: 26rpx;
      color: #444;
    }
    .type {
      line-height: 1.8;
      padding: 0 15rpx;
      font-size: 24rpx;
      align-self: flex-start;
      border-radius: 4rpx;
      color: #888;
      background-color: #f7f7f8;
    }
    .price {
      line-height: 1;
      font-size: 26rpx;
      color: #444;
      margin-bottom: 2rpx;
    }
    .warning {
      color: #cf4444;
      font-size: 24rpx;
    }
    .quantity {
      position: absolute;
      bottom: 20rpx;
      right: 5rpx;
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 220rpx;
      height: 48rpx;
      .text {
        height: 100%;
        padding: 0 20rpx;
        font-size: 32rpx;
        color: #444;
      }
      .input {
        height: 100%;
        text-align: center;
        border-radius: 4rpx;
        font-size: 24rpx;
        color: #444;
        background-color: #f6f6f6;
      }
    }
  }
  .swipe-cell {
    display: block;
    margin-top: 20rpx;
    &:first-child {
      margin-top: 0;
    }
  }
}
/* 购物车商品 */
/* 购物车状态提示 */
.blank {
  padding: 100rpx 0 60rpx;
  text-align: center;
  color: #444;
  font-size: 26rpx;
  .button {
    width: 240rpx !important;
    height: 60rpx;
    line-height: 60rpx;
    margin-top: 25rpx;
    font-size: 26rpx;
    border-radius: 60rpx;
    color: #fff;
    background-color: #27ba9b;
    &::after {
      display: none;
    }
  }
}
/* 吸底工具栏 */
.toolbar {
  position: relative;
  padding: 32rpx 20rpx 28rpx;
  border-top: 1rpx solid #ededed;
  border-bottom: 1rpx solid #ededed;
  background-color: #fff;
  .all {
    margin-left: 25rpx;
    font-size: 14px;
    color: #444;
    &::before {
      font-family: "erabbit" !important;
      content: "\e6cd";
      font-size: 36rpx;
      margin-right: 8rpx;
      vertical-align: -4rpx;
    }
  }
  .checked {
    &::before {
      content: "\e6cc";
      color: #27ba9b;
    }
  }
  .text {
    margin-right: 8rpx;
    margin-left: 32rpx;
    color: #444;
    font-size: 14px;
  }
  .amount {
    font-size: 20px;
    color: #cf4444;
    vertical-align: -1px;
    &::before {
      content: "￥";
      font-size: 12px;
    }
    .decimal {
      font-size: 12px;
    }
  }
  .buttons {
    position: absolute;
    right: 10rpx;
    top: 50%;
    display: flex;
    justify-content: space-between;
    text-align: center;
    line-height: 72rpx;
    font-size: 13px;
    color: #fff;
    transform: translateY(-50%);
    .button {
      width: 240rpx;
      margin: 0 10rpx;
      border-radius: 72rpx;
    }
  }
  .payment {
    background-color: #27ba9b;
  }
  .disabled {
    opacity: 0.6;
  }
  .delete {
    display: none;
    background-color: #27ba9b;
  }
  .collect {
    display: none;
    background-color: #ffa868;
  }
}
.swipe-cell-action {
  display: flex;
  height: 100%;
  button {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 50px;
    padding: 6px;
    line-height: 1.5;
    color: #fff;
    font-size: 26rpx;
    border-radius: 0;
  }
  .collect-button {
    background-color: #ffa868;
  }
  .delete-button {
    background-color: #cf4444;
  }
}
</style>